00341nas a2200133   4500000000100000000000100001008004100002260001400043100001900057700001800076245009400094300001200188490000700200       2015                            d  cNov. 20151 aQingfeng Cheng1 aChunming Tang00aCryptanalysis of an ID-based Authenticated Dynamic Group Key Agreement with Optimal Round  a678-6820 v17